Screw-threading apparatus



J. M. COOK SCREW THREADING APPARATUS June 17, 1930.

' 2 Sheets-Sheet l Filed June 8, 1927 June 17, 1930. J cook SCREW THREADING APPARATUS File d Jxine 8,1927 ZSfi'eets-Sheefc 2 James M ('00! Patented June 17, i 1930 f vulfrso' srarss (P TENT o'rrlcs James nrn'roncooyx, or LA cannon, InLmoIs, assrenon 'ro was rm Emazoram co'mrm, mconronarnn, or NEW YORK, N; Y., a oonromrron or nnw'yonx sonnw-rnnnanmo Arrm'rus Application filed June 8,

Thisinvention relates to material working apparatus, and more particularly to" of the invention, one embodiment thereof constituting a screw blank threading apparatus includes a screw mechanism provided with. spiral ways for receiving screw blanks from a rotary hopper. Blanks properly positioned within the ways are advanced toa storage portion thereof. and improperly positioned blanks are-ejected. From 'the storage portion .the blanks are'advanced in predetermined spaced relation to a rotary threader and individual blanks are forced into the threader by a cam' actuated slide controlled by-- the screw mechanism.

These and other objects will be" more scription and the accompanying drawing, wherein Fig.1' is' a fragmentary plan view of a screw threading apparatus representing one embodiment of-the invention. the stop mech- 1 anism beingremoved therefrom;

on the line as mechanism taken on the line 3-3 of Fig. -1

' Fig. 2 is a detailed sectional.

22 of Fig. l'disclosing the elements constituting the transfer mechanism;

.Fig. 3 is a transverse sectionof the screw disclosing'a screw blank properly within the spiral way, a d- I Fig. 4-is a vertical sectional view taken on -the, line 44 of Fig. 1,-t'he rotary hopper 1 being" shown in'section to more clearly illuspositioned tratethe parts otherwise hidden.

Referring now to the drawings wherein. like numerals have been employed to des1gn-ate similar parts throughout the various figures, it will be observed thata'screw mech anism or .conveyor denoted generally by the numerallO comprlsing a pair of parallel screws '11 and 12havingcontinuous s iral 5 ways 13 formed-therein is positioned a ove deposited thereon in indiscriminate order apparent from the following detailed de- 'ew taken 1927. Serial 8027192 258 machine frame portions 15- and 16. The;

screws 11 and 12 are inclined from the horizontal, the screw 11 being journaled between suitable bearings 17 and 18 while the screw 12 is journaled between bearings 20 and 21. The upper extremity of the screw 12 supports a gear'22 which meshes with a companion gear 23 carried by the screw'll and the screw 11 is connected with .a vertical drive shaft 24'by means of bevellgears 25 and 26; It is to be understood that when a screw blank 28.is properly positioned between companion portions of the spiral ways 7 $13 of the screw mechanism 10 .as ,clearlly 'shown'in Fig. 3, such a blank will be a vanced upon the rotation of thescrews 11 and 12 and when the advanced screw blank reaches the lower end of the screw 11, it will be advanced into position between a guide plate 29 .(Fig. 1) and the lowerportion of the screw 12. The lower extremity of the screw 12' is enlarged and the spiral way 13 therein cooperating with the guide plate 29 operates to convey or feed thblank intov a position indicated by thenumeral 30 (Figs. 1, and 2). In this position the advanced scazew blank 28 may be acted upon by a transfer mechanism 32 which serves to advance the blank into association with a'threadingmechanism denoted generally by the numeral33. i

. The transfer mechanism 32 (Figs. 1 and 2) comprises a lever 34'which is pivoted intermediately thereof to the bearing 20. di'ately beneath the pivoted portion of the lever 34 is a roller 36 whichengages the'pe-' ripheral surface of the lower extremity of the screw '12, contact of the roller with the 1 4 .peripheral surface being maintained through theaction of a coil spring 37 interposed between the upper extremity of the lever 34 j and a fixed eyebolt 38. A camgroove-40 provided in the screw 12 is designed'toreceive the roller 36 ,of'the transfer mechanism 32v and functions tocau'se the reciprocation of the lever 34 upon each-rotation of the screw 12.- Theiower extremity of the lever 34 is bifurcated to receive a .pin 41 Fig. 2) which connects the lever with a sli" e mem- ;ber 42 and from the foregoing it will be clear that upon each rotation of the screw 12 the slide 42 will experience a complete reciprocation. The forward movement of the slide 42 operates to advance the screw blank 28 which has been positioned by the screw 12 and transfer said blank to the rotary die mechanism 33. In this connection it will be observed that the forward surface of the slide 42 which engages the shank of the blank 28 10 is beveled so as to positively force the blank into position to be received by the threading mechanism 33, and immediately upon the return of the slide, another screw blank is fed into the position indicated by the numeral 30 to be subsequently acted upon or transferred by the slide.

The threading mechanism 33 comprises a movable or rotary die 44 which is securely mounted upon a vertical spindle 45 by means go of a tapered split collar 46 (Fig. 4) and suitable clamping members 48 and 49. The spindle 45 is rotatable upon roller bearin 50 and 51, the lower extremity of thespimfi e 45 being connected with a suitable driving mech- 25 anism (not shown). A pair ofsegmental die members 53 oppositely disposed from the axis of the spin segmental holding blocks 54 and are secured in position by means of clamps 55 and asso-' 30 ciated clamiing nuts 56. The se ental holding bloc s 54 are rigidly secure to the machine frame 15 by means of suitable machine bolts .58 and it will be observed that the purpose for having a pair of such blocks and i The function of these twoscrew mechanisms are identical and therefore the. complete structure of only one of the'mechanisms' has been described. From the foregoing it is to be understood that when a screw blank 28 is transferred by the action of the reciprocating slide 42 from .the position30, this blank will be gripped between. the threads of therotating die 44 and the companionfixed die 53 so as to quickly and accurately thread the blank.

Upon emergin from between. the dies 44 and 'ted within an 53' the threade blank is de opening'59 from which point it 'is.;.delivered by gravity to'a suitable receiving tray (not shown). The lowerend ofthe spindle 45 supports a ear which serves toimpart rotationto t e vertical shaft 24 through the medium of a gear 62, a shaft 63' and bevel gears 64 and 65.

blanks to the upper rtion of the screw mechanism 10, a rotary op r 67 is rovided which is rotatable upon sultable, ro er bearings 68. Continuous rotation. is imparted to the hopper 67 by a gear .69which 1s supported b a shaft 70 having ared connection wit the vertical drive 8 aft 24. The

' '65 blanks may be directed into the hopper 67 by 1e 45 are supported within thereof from then the spiral way.

Inorder to continuously deliver the screw 1 blank wor 7 means of a chute 72 and cross bars 71 ositioned adjacent the inner surface of the opper casing operate tolift screw blanks within the hopper and cause the same to be deposited in indiscriminate order upon a section of the screws 11 and 12 designated by the numeral 73. The pitch of the spiral ways 13 in the section 73 is such that properly positioned screw blanks may be advanced in close proximity with one another until a section of the screws denoted by .the numeral 74 is reached. In this section the. pitch of the spiral ways is increased toquickly advance individual screws over recessed ortions of the screws 11 and 12 to permit 0 the downward displacement of improperly positioned screw blanks onto the chute 72. From thesection 74 the screws are advanced to a section 75 where properly positioned blanks are stored and, successively fed therefrom in proper predetermined spaced relation by the ways in a section 76 of the screw 12.

In order to prevent the continuous ad .vancement of properly positioned screwblanks within the section 74 after the storage section 75 has been completely filled, a stop mechanism 78 is provided (Fig. 4) which includes a pivoted finger 7 9 having a de ending tip 80 which is adapted to be moved downwardly so as to obstruct the continued ad vancement of blanks. The downward movement of the'depending ti 80 is occasioned through the actuation o a pivoted guar'd member 82 which is adapted to be raised up wardly as a result of the backing u of screw Y blanks when the section 75 has Eeen 'completely filled. A fixed guard member 83 rests lmmediately above the heads of properly positioned screw blanks as. clearly shown m 'Fig. 3 and thereby prevents the dislodgment proper positions within From the foregoin 't willbe clear that th'escrew blanks maybe indiscriminately deposited upon the section 73 of the crew m'echanisinlO and-blanks peroperly positioned within the ways 13 will advanced to the .lower extremity of the screw 12 at which point the transfer mechanism 32 operates to positive] feed individual blanks at predetermin intervals into position between the dies 44 and 53.

The described apparatus presents avery com act deYjC6;Wh 10h is capable of greatly aoce e the production of threads in in continuous succewon.

.What,isclaimed is: 1. .In a paratus for working blanks, a means, a reciprocable means for feeding in 'vidual blanks to the working, meansat predetermined intervals, a screw mechanism operable in timed relation with the feeding means and having a spiral way'for advancing associated in a predetermined spaced relation to feed mdividual blanks directly to the reciprocable sup 1y thereof to fee individual blanks di rect mechamsm.

feeding means.

2. In apparatus for threading blanks, a blank threading mechanism including a rotary die, means for successively feeding blanks to the threading mechanism at predetermined intervals, and a screw mechanism operable in timed relation with the feeding means and having a spiral way for advancing blanks in a redetermined' spaced relation to deliver in ividual blanks to the feeding means.

. 3. In apparatus for threading blanks, a blank threading mechanism, means for suca receiving station to a discharge station, a movmg conveyor adapted to deliver a blank to a point adjacent t e receiving station at predetermined intervals, and a reciprocating member operable in synchronism with the movement of the conveyor to move the blank groin said point intoposition between the 8. In apparatus for threading screw blanks, a rotary threading die, a stationary die cooperating with the rotary die to form threads on the blanks and to advance the blanks from a receiving station to a discharge station, a rotary spiral conveyor adapted to deliver a blank to a point adjacent the receiving station at predetermined intervals, and a reciprocating member controlled by the rotation of the conveyor and having a beveled surface adapted to move the blanks from said point into position between the dies.

In witness whereof, I hereunto subscribe my name this 28th day of May, A. D. 1927.

\ JAMES MILTONCOOK.

nism having a spiral way for advancing screw blanks in spaced relation to feed blanks to the reciprocable member at predetermined intervals, and means operatively connecting the reciprocable member with the screw 5. In apparatus for threading screw blanks, a movable threadin die, a reciprocable member for feeding individual screw blanks to the movable threading die, a screw mechanism provided with a cam surface and having a spiral way for advancing screw blanks in spaced relation to feed blanks to the reciprocable member. at predetermined intervals, a pivoted member connected with the reciprocable member, and a follower car- 'ried by the pivoted member and operatively associated with the cam. surface on the screw mechanism.

6. In apparatus for threading screw blanks, a threading mechanism including a rotary die and a fixed die companion thereto, a reciprocable member for successively feeding mdividualblanks between the rotary and fixed dies, a screw mechanism 0 erable, in desponse to the movement of' t e rotary Ldi'e provided with a cam surface and having. a spiral way for advancing screw. blanks in s ace'd relation from a to the recigrocable .member at prede-' termmed interva an with the cam surface to actuate the IQOlPIOCE- ble member during .each revolution of the screw mechanism.--

7 In a material working apparatus, a pair of relatively rotatable coo rating dies designed to operate upon a lank sitione'd therebetweenand to advance. the b from d meanscooperating. 

